Clinical study
HLA-C and -Bw typing of couples with unexplained recurrent miscarriages

https://doi.org/10.1016/S0165-0378(97)00073-9Get rights and content

Abstract

There is now evidence that the classical HLA class I molecule HLA-C is expressed on extravillous trophoblasts together with non-classical HLA-G molecules. Since clones of NK-cells are inhibited differently by supertypic epitopes associated with HLA-C and -B alleles we found it of interest to study HLA-C and -Bw polymorphism in 35 couples with recurrent miscarriage and 30 control couples with normal fecundity. All HLA assignments were undertaken by DNA techniques. The distribution of HLA-C alleles or the HLA-C associated supertypic epitopes recognized by NK1 or NK2 clones was not significantly different between patients and controls. The distribution of couples according to the number of NK1 and NK2 epitopes in the couple was similar in patients and controls. With respect to the HLA-Bw epitopes recognized by NKB1 clones, in 46% of the couples with recurrent miscarriage none of the spouses carried the HLA-Bw4 epitope compared with only 17% of the control couples (P<0.02). It is concluded that the HLA-Bw4 epitope is carried more frequently by couples with normal fecundity than couples with recurrent miscarriage. The fetuses of couples with recurrent miscarriage are thus expected to lack expression of HLA-Bw4 epitopes on the trophoblast more often than fetuses of normal couples which might be of importance for the inhibition of NK-cell mediated antitrophoblast cytotoxicity.

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      All studies, which investigate HLA sharing and used molecular typing method, mentioned whether they used high or low resolution typing. Three studies used high resolution [59–61] and five used low resolution [45,53,62–64]. A greater risk for bias was that only 14 out of 21 studies which investigated HLA sharing defined adequately which antigens and alleles were used to calculate sharing.

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      KIR ligand (HLA class I) sharing between the mother and her partner or fetus has been extensively studied. Paradoxically, although HLA-C is the only polymorphic HLA molecule expressed on extravillous trophoblasts, reports on the effect of HLA-C allele sharing on RSA risk are scarce and contradictory (Christiansen et al., 1997; Beydoun and Saftlas, 2005). We observed almost five times lower frequencies of C1C2 women pregnant by C2C2 males in the miscarriage than in the control group, suggesting a protection from abortion with this combination.

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